Variable-speed gearing.



I. HOFFMAN.

VARIABLE SPEED ammo.

APPLIOL'I'IOI FILED IALQS, 1914.

Patented Oct. 13,1914

ml NOIIII Pm" m. rncmum. 'IMIIGIDI. A C.

JOSEF HOFFMAN, or CLEVELAND, 01110.

VARIABLE-SPEED Guanine.

' Specification of Letters ?atent,

Patented Oct. 13, 1914,

Application filed March 23, 1914. Serial No. 826,584.

To all whom it may concern:

Be it known that I, Joser HOFFMAN, a subject of the Empire ofAustria-Hungary, residing at Cleveland in the county of Guyahoga andState of Ohio, have invented certain new and useful Improvements inVariable-Speed Gearing, of which the following is a specification. t v

This inventionrelates to variable speed gearing, and has for its objectto provide an improved gearing for varying the speed of a driven shaftwith respect to a driving shaft.

The structure embodies driven and driving shafts, of which the former iseccentrically mounted with respect to the latter. The driven shaft isrotated by direct gearing from the driving shaft, and it is also mountedin' 'a sleeve eccentric to the driving shaft so that when the sleeveisrotated the driven shaft is revolved .with respect to'the axis of thedriving shaft, and the speed of rotation of the sleeve may be varied bya friction gear, so that the effective speed of 25,rotation of thedriven-shaft is the component of the speed of rotation imparted to it bythe driving shaft, as reduced by the Y speed of revolution imparted toit, as it rotates, by the sleeve. The driven shaft thus rotates and alsorevolves, and the revolution varies the transmitted speed.

The invention is illustrated in the accompanying drawings in whichFigure 1 is a longitudinal'sectional view .of-the gearing. Fig. 2 is asection on the line 2-2 of Fig; 1

Referring specifically to the drawings, the driving shaft is indicatedat A and the driven shaft at C. The former is mounted in bearings 6 andcarries a pinion D which meshes with .an internal gear E which is faston the end of the shaft (7-. Consequently the shaft A rotates the shaftC by means of the pinion D and the gear-E.

The shaft is eccentrically mounted for rotation in a sleeve F which isrotatable in bearings 7 forming a part of a frame 8.

The axis of the shaft C is eccentric to that i ast mentioned shaft. iseccentric to both. When the sleeve F is- 7 bination of a driving shaft,a driven shaft of the shaft A, and the axis of the sleeve F rotated inits bearings 7 it revolves the shaft C and causes the gear E to travelaround or with'respect to the gear D.

The sleeve. F is driven or rotated by a,

pinion K mounted on a stud L attached to he frame, by means of a gear Gwhich is fast on the sleeve Fand which meshes with said pinion K. gearHfast onja. counter-shaft B supported in a bearing 9 on the frame, andthis shaft B also carries a friction disk I whichis driven by ashiftable friction wheel X from a friction disk M which is fast on theshaft A. The wheel X is mounts, on a shifting rod Nwhich works through aguide 10 on the frame and which may be shifted by-a lover O operated byhand or otherwise. By shifting the Wht X the speed of the shaft B andconsequently ofthe sleeve-Fwill be varied in an obvious manner, thespeed of the sleeve being increased as the wheel X is shifted towardthe'shaft-B and decreased -by the reverse, or I the shaft B may bestopped altogether b shifting the Wheel X out of contact with t e diskM.

hen the wheel X is inactive the shaft C will be driven at a constantspeed determined by the relative proportions of the gears D and E; 1This is the highest speed. When the wheel X is shifted to drive theshaft B, the sleeve F is turned accordingly, and its direction ofrotation is the same as that of the shaft C. The shaft C will thenrevolve This DlIllOIl meshes with a or have an orbital motion which willcause.

the gear E to travel around or with respect to the pinion D, and thefaster the sleeve is driven the slower the relative rotation, of theshaft C will be. The shaft G will thus have a combined rotation andrevolution, the variable speed of the latter of which will determine theeffective speed of rotation thereof. The shaft C will be connected toits work in any suitable manner, as by a system of universal joints, ora flexible shaft, (not shown).

l/Vhat L'claim as new is:

1. In a variable speed gearing, the coinbiuation of a. dr ving shaft,aT'driver shaft,

gears between. said shafts. a notary sleeve in which one of said shaftsis rotatably mounted ecccntrlc to the other shaft. and variable speedgearing between said sleeve and the In a variable speed gearing. thecomeccentric thereto, an internal gear on the 1 which I the driven shaftsgeed friction gearing 'bination' of a driving shaft, a pinion thereon",

eccentrically mounteddonrotation therein, and variable -.speed gearingbetween the driving shaft and I the sleeve, torotate. the latter andrevolve 5 I v the driven shaft.

a variable speed caring, the corn- *bination of adriving sha eccentricto the driving shaft, a counter shaft, gearingbetween'the counter shaftand the sleeve to rotate the latter and therebv revolve the drivenshaft, and variable friceccentrically 7 tion gearing between the'countershaft.

5. In a variable speed caring, the combination of a driving sha t,-adrivenshaft eccentric thereto, direct driving means be tween saidshafts, to rotate the latter and .means to revolve the driven shaft withre- I spect to the axis of the driving shaft, as

the former rotates, of rotation. I

6. In avariable speed gearing, 'the com bination of a to vary itseffective speed the driving shaft and driving shaft, a drivemshafteccentric thereto, direct driving means between said shafts, to rotatethe latter, and means driven by the driving shaft to revolve the drivenshaft with respect tothe axis of the drivin shaft, as the formerrotates, to vary its ei ective speed'of rotatio In testimony whereof, I'do aflix my signature in presence of two Witnesses 'JOSEF HOFFMAN.Witnesses:

'JOHN A. BOMMHARDT,

D. C. REED.

